Quantum Random Number Generator Using Thermal Light Intensity Fluctuations
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Solution Overview
Problem
Conventional random number generators (RNGs) fail to produce truly random numbers with full quantum entropy, as they rely on pseudo-random processes or classical noise, which are predictable and lack the inherent unpredictability of quantum phenomena, limiting their application in cryptography and other fields that require high-quality randomness.
Innovation Solution
The development of quantum random number generators (QRNGs) that harness the irreducible unpredictability of quantum physics, specifically using thermal light sources to generate random numbers based on intensity fluctuations of photons, ensuring high entropy and resistance to classical noise interference, with the ability to operate at high rates and low costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional RNGs use thermal noise or shot noise from electronic components, then random number generation is achieved, but the device requires excessive wafer area when implemented in an integrated circuit
Solution Approach 1:
The patent replaces electronic/thermal noise-based random number generation with optical-based random number generation using photons. The system uses a light source, optical beam splitter, and photon detectors to generate random numbers based on quantum optical effects rather than thermal or shot noise from electronic components, thereby reducing the required wafer area while maintaining or improving randomness quality
Solution Approach 2:
The patent changes the fundamental physical parameter used for random number generation from electrical/thermal domain to optical domain. By using photon statistics and optical intensity fluctuations instead of electronic thermal noise, the system achieves compact integration while preserving the quality of randomness
2Productivity
If conventional RNGs use pseudo-random processes, then long sequences of random numbers can be produced, but the numbers are not completely statistically unrelated and lack true randomness
Solution Approach 1:
The patent replaces pseudo-random software algorithms with quantum optical processes. By measuring optical intensity fluctuations from a light source using photon detectors, the system generates true random numbers based on quantum effects rather than deterministic pseudo-random sequences, ensuring complete statistical independence while maintaining high generation rates
Solution Approach 2:
The patent transitions from deterministic computational random number generation to stochastic quantum optical measurement. By using the inherent randomness of photon detection and optical intensity fluctuations, the system achieves true statistical randomness while maintaining productivity through high-speed optical detection
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
QRNGs produce random bit streams with full quantum entropy, passing comprehensive statistical tests and providing high-speed, secure randomness suitable for cryptographic applications, outperforming traditional RNGs by leveraging the fundamental unpredictability of quantum phenomena.
Implementation Method 1
capture the irreducible unpredictability of quantum physics as exhibited in the intensity fluctuations of thermal light
Implementation Method 2
a photodetector configured to detect the optical flux
Data Source
AI summary
Random number generators include a thermal optical source and detector configured to produce random numbers based on quantum-optical intensity fluctuations. An optical flux is detected, and signals proportional to optical intensity and a delayed optical intensity are combined. The combined signals can be electrical signals or optical signals, and the optical source is selected so as to have low coherence over a predetermined range of delay times. Balanced optical detectors can be used to reduce common mode noise, and in some examples, the optical flux is directed to only one of a pair of balanced detectors.